Again, what do you mean by that? Most (all?) Facebook ads already state which business page they're associated with. (I'm admittedly not on Facebook, but I have trafficked some ads for work.)

If you're asserting that Facebook should say who's REALLY behind by the ads, you're basically asking for Facebook to hire a crack team of private investigators. Should they be responsible for figuring out that Nice Ad Buyers LLC is really a wholly-owned subsidiary of some other corporation, which some neo-nazi millionaire owns the controlling stake of?